knowledgebrain

Local-first AI second brain

Free · Designed for iPad. Not verified for macOS.

Local-first AI second brain. Local-first, your data never leaves your devices. KnowledgeBrain is a local-first personal knowledge base: collect scattered text, voice memos, PDFs, EPUBs and clippings into one searchable, question-answering "second brain". CORE FEATURES • Capture everything: text, voice notes (on-device transcription), PDF, EPUB, photo OCR, and one-tap saving via the system share extension • Ask your knowledge (RAG): ask questions against your own library — every answer comes with citations you can trace back to the source • On-device first: vector search, speech transcription and OCR all run locally. On devices with Apple Intelligence, answers are generated entirely on-device at zero cloud cost • BYOK: connect any OpenAI / Anthropic-compatible API with your own key and quota. Custom base URLs supported (DeepSeek, Zhipu, OpenRouter and more) • Auto-organization: AI-generated summaries and tags keep your library findable as it grows • iCloud sync: data lives in your private iCloud database, synced across devices, invisible to the developer • Open data: one-tap Markdown export to iCloud Drive — your knowledge is never locked in No accounts, zero data collection, no tracking, no ads. Your knowledge lives only on your devices and in your iCloud. API keys stay in the system Keychain and are sent only to the provider you configure. BUILT FOR MAKERS Made for developers and knowledge workers: if you're comfortable configuring an API key and you care about data ownership, this is the knowledge tool built for you.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

The developer, 玉祥 余, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • 玉祥 余
    Size
    • 262.4 MB
    Category
    • Productivity
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 3 more
    • English, Japanese, Simplified Chinese, Traditional Chinese
    Age Rating
    4+
    Copyright
    • © 2026 YUYUXIANG
  • Privacy Policy

    • More by 玉祥 余